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31 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
35 #ifndef _SYS_SOCKBUF_H_
36 #define _SYS_SOCKBUF_H_
39 * Constants for sb_flags field of struct sockbuf/xsockbuf.
41 #define SB_WAIT 0x04 /* someone is waiting for data/space */
42 #define SB_SEL 0x08 /* someone is selecting */
43 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
44 #define SB_UPCALL 0x20 /* someone wants an upcall */
45 #define SB_NOINTR 0x40 /* operations not interruptible */
46 #define SB_AIO 0x80 /* AIO operations queued */
47 #define SB_KNOTE 0x100 /* kernel note attached */
48 #define SB_NOCOALESCE 0x200 /* don't coalesce new data into existing mbufs */
49 #define SB_IN_TOE 0x400 /* socket buffer is in the middle of an operation */
50 #define SB_AUTOSIZE 0x800 /* automatically size socket buffer */
51 #define SB_STOP 0x1000 /* backpressure indicator */
52 #define SB_AIO_RUNNING 0x2000 /* AIO operation running */
53 #define SB_TLS_IFNET 0x4000 /* has used / is using ifnet KTLS */
55 #define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
56 #define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
57 #define SBS_RCVATMARK 0x0040 /* at mark on input */
59 #if defined(_KERNEL) || defined(_WANT_SOCKET)
60 #include <sys/_lock.h>
61 #include <sys/_mutex.h>
63 #include <sys/_task.h>
65 #define SB_MAX (2*1024*1024) /* default for max chars in sockbuf */
75 * Variables for socket buffering.
77 * Locking key to struct sockbuf:
78 * (a) locked by SOCKBUF_LOCK().
79 * (b) locked by sblock()
82 struct mtx sb_mtx; /* sockbuf lock */
83 struct sx sb_sx; /* prevent I/O interlacing */
84 struct selinfo *sb_sel; /* process selecting read/write */
85 short sb_state; /* (a) socket state on sockbuf */
86 #define sb_startzero sb_mb
87 struct mbuf *sb_mb; /* (a) the mbuf chain */
88 struct mbuf *sb_mbtail; /* (a) the last mbuf in the chain */
89 struct mbuf *sb_lastrecord; /* (a) first mbuf of last
90 * record in socket buffer */
91 struct mbuf *sb_sndptr; /* (a) pointer into mbuf chain */
92 struct mbuf *sb_fnrdy; /* (a) pointer to first not ready buffer */
93 u_int sb_sndptroff; /* (a) byte offset of ptr into chain */
94 u_int sb_acc; /* (a) available chars in buffer */
95 u_int sb_ccc; /* (a) claimed chars in buffer */
96 u_int sb_hiwat; /* (a) max actual char count */
97 u_int sb_mbcnt; /* (a) chars of mbufs used */
98 u_int sb_mcnt; /* (a) number of mbufs in buffer */
99 u_int sb_ccnt; /* (a) number of clusters in buffer */
100 u_int sb_mbmax; /* (a) max chars of mbufs to use */
101 u_int sb_ctl; /* (a) non-data chars in buffer */
102 int sb_lowat; /* (a) low water mark */
103 sbintime_t sb_timeo; /* (a) timeout for read/write */
104 uint64_t sb_tls_seqno; /* (a) TLS seqno */
105 struct ktls_session *sb_tls_info; /* (a + b) TLS state */
106 short sb_flags; /* (a) flags, see above */
107 int (*sb_upcall)(struct socket *, void *, int); /* (a) */
108 void *sb_upcallarg; /* (a) */
109 TAILQ_HEAD(, kaiocb) sb_aiojobq; /* (a) pending AIO ops */
110 struct task sb_aiotask; /* AIO task */
113 #endif /* defined(_KERNEL) || defined(_WANT_SOCKET) */
117 * Per-socket buffer mutex used to protect most fields in the socket
120 #define SOCKBUF_MTX(_sb) (&(_sb)->sb_mtx)
121 #define SOCKBUF_LOCK_INIT(_sb, _name) \
122 mtx_init(SOCKBUF_MTX(_sb), _name, NULL, MTX_DEF)
123 #define SOCKBUF_LOCK_DESTROY(_sb) mtx_destroy(SOCKBUF_MTX(_sb))
124 #define SOCKBUF_LOCK(_sb) mtx_lock(SOCKBUF_MTX(_sb))
125 #define SOCKBUF_OWNED(_sb) mtx_owned(SOCKBUF_MTX(_sb))
126 #define SOCKBUF_UNLOCK(_sb) mtx_unlock(SOCKBUF_MTX(_sb))
127 #define SOCKBUF_LOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_OWNED)
128 #define SOCKBUF_UNLOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_NOTOWNED)
131 * Socket buffer private mbuf(9) flags.
133 #define M_NOTREADY M_PROTO1 /* m_data not populated yet */
134 #define M_BLOCKED M_PROTO2 /* M_NOTREADY in front of m */
135 #define M_NOTAVAIL (M_NOTREADY | M_BLOCKED)
137 void sbappend(struct sockbuf *sb, struct mbuf *m, int flags);
138 void sbappend_locked(struct sockbuf *sb, struct mbuf *m, int flags);
139 void sbappendstream(struct sockbuf *sb, struct mbuf *m, int flags);
140 void sbappendstream_locked(struct sockbuf *sb, struct mbuf *m, int flags);
141 int sbappendaddr(struct sockbuf *sb, const struct sockaddr *asa,
142 struct mbuf *m0, struct mbuf *control);
143 int sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
144 struct mbuf *m0, struct mbuf *control);
145 int sbappendaddr_nospacecheck_locked(struct sockbuf *sb,
146 const struct sockaddr *asa, struct mbuf *m0, struct mbuf *control);
147 void sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
148 struct mbuf *control);
149 void sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
150 struct mbuf *control);
151 void sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
152 void sbappendrecord_locked(struct sockbuf *sb, struct mbuf *m0);
153 void sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
155 sbcreatecontrol(caddr_t p, int size, int type, int level);
156 void sbdestroy(struct sockbuf *sb, struct socket *so);
157 void sbdrop(struct sockbuf *sb, int len);
158 void sbdrop_locked(struct sockbuf *sb, int len);
160 sbcut_locked(struct sockbuf *sb, int len);
161 void sbdroprecord(struct sockbuf *sb);
162 void sbdroprecord_locked(struct sockbuf *sb);
163 void sbflush(struct sockbuf *sb);
164 void sbflush_locked(struct sockbuf *sb);
165 void sbrelease(struct sockbuf *sb, struct socket *so);
166 void sbrelease_internal(struct sockbuf *sb, struct socket *so);
167 void sbrelease_locked(struct sockbuf *sb, struct socket *so);
168 int sbsetopt(struct socket *so, int cmd, u_long cc);
169 int sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
171 void sbsndptr_adv(struct sockbuf *sb, struct mbuf *mb, u_int len);
173 sbsndptr_noadv(struct sockbuf *sb, u_int off, u_int *moff);
175 sbsndmbuf(struct sockbuf *sb, u_int off, u_int *moff);
176 int sbwait(struct sockbuf *sb);
177 int sblock(struct sockbuf *sb, int flags);
178 void sbunlock(struct sockbuf *sb);
179 void sballoc(struct sockbuf *, struct mbuf *);
180 void sbfree(struct sockbuf *, struct mbuf *);
181 int sbready(struct sockbuf *, struct mbuf *, int);
184 * Return how much data is available to be taken out of socket
188 sbavail(struct sockbuf *sb)
192 SOCKBUF_LOCK_ASSERT(sb);
198 * Return how much data sits there in the socket buffer
199 * It might be that some data is not yet ready to be read.
202 sbused(struct sockbuf *sb)
206 SOCKBUF_LOCK_ASSERT(sb);
212 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
213 * This is problematical if the fields are unsigned, as the space might
214 * still be negative (ccc > hiwat or mbcnt > mbmax).
217 sbspace(struct sockbuf *sb)
219 int bleft, mleft; /* size should match sockbuf fields */
222 SOCKBUF_LOCK_ASSERT(sb);
225 if (sb->sb_flags & SB_STOP)
228 bleft = sb->sb_hiwat - sb->sb_ccc;
229 mleft = sb->sb_mbmax - sb->sb_mbcnt;
231 return ((bleft < mleft) ? bleft : mleft);
234 #define SB_EMPTY_FIXUP(sb) do { \
235 if ((sb)->sb_mb == NULL) { \
236 (sb)->sb_mbtail = NULL; \
237 (sb)->sb_lastrecord = NULL; \
239 } while (/*CONSTCOND*/0)
242 void sblastrecordchk(struct sockbuf *, const char *, int);
243 void sblastmbufchk(struct sockbuf *, const char *, int);
244 void sbcheck(struct sockbuf *, const char *, int);
245 #define SBLASTRECORDCHK(sb) sblastrecordchk((sb), __FILE__, __LINE__)
246 #define SBLASTMBUFCHK(sb) sblastmbufchk((sb), __FILE__, __LINE__)
247 #define SBCHECK(sb) sbcheck((sb), __FILE__, __LINE__)
249 #define SBLASTRECORDCHK(sb) do {} while (0)
250 #define SBLASTMBUFCHK(sb) do {} while (0)
251 #define SBCHECK(sb) do {} while (0)
252 #endif /* SOCKBUF_DEBUG */
256 #endif /* _SYS_SOCKBUF_H_ */